Composites' market trends (French)

Fibre glass composite applications-reinforcements of thermoplastic and thermosetting resins-represent approximately 5,5 million tonnes world-wide, with an annual growth rate of 5,6% since 1991. Globally, the thermosetting compsites represent 75% of the market. Their growth rate over the 1991-1998 period is 4,5%, when reinforced thermoplas..

Surgical: Suture with improved tensile strength

Ethicon of Somerville, New Jersey, has filed a US patent for a polyamide suture claimed to have improved knot strength, tensile strength and structural stability. The suture is made by melt-extruding and quenching a fine denier polyamide filament, such as polycapromide or polyhexamethylene adipamide, and drawing it at a draw ratio of 3.0-..

Polyprpylene fibres

The claim concerns the melt spinning of polypropylene fibers from a polymer based on isotactic polypropylene and a transition metal selected from the group consisting of titanium, zirconium, hafnium and vanadium. The polymer is heated to form a melt which is extruded to produce a fibre preform. This is then spun at at least 5000 m/min and..

Antibacterial cellulose and production process thereof

In this invention solvent spinning is used to produce cellulosic fibres with antibacterial properties, tertiary amine N-oxide being used as a solvent for pulp. The antibacterial agetn used is a sliver-based compound. IPC D01F.

Polyurethanes: Applications and consumption (Italian) (Poliuretani: Applicazioni e consumi)

Polyurethanes, condensation polymers formed from polyhydroxy compounds and polyisocyanates, are described. The main advantages of polyurethanes are their versatility and durability. They can have either a rigid or a flexible form. The most important commercial form is expanded polyurethane, known as polyurethane foam. One type of semi-exp..

Tencel - the natural feeling: Trademark policy - variant for knitting - fashion trends (Italian) (Tencel - the natural feeling: Politica del marchio - variante per la maglia - tendenze della moda)

The next step in the development of Tencel is to explore its potential in blends. In the with this policy Acordis Fibres has decided to reduce the minimum percentage of Tencel required for blends and the trademark can now be applied to products with a minimum of 40% Tencel. Tencel A100 is a new product created in the first place for knitw..

Is the Folded-Chain Structure Possible in Cellulose Molecule?

A molecular dynamics simulation technique investigated the folded chain structures of the cellulose molecule. The simulation applied chain molecules based on the flexible ring structure model of glucose residues. Simulation near room temperature did not detect the conformational transitions of the ring structures. The optimized structures..

Future Quality Measurements

The Cotton Program currently reports seven high volume instrument (HVI) fiber quality measurements in the cotton classification process: micronaire, length, length uniformity index, strength, Rd color, +b color, and percent area of trash. Evaluations to improve measurements have included changes in HVI color grade determination to improve..

Image Analysis for the Measurement of Cotton Fiber Parameters.

Image analysis is an effective technique for improving the measurement of the fineness and maturity of cotton fibers. Correlations between such parameters as fiber perimeter, surface area, cross section, maturity, and length are important during fiber testing. It is critical that sampling be conducted to include length categories. Fibrogr..

New Insight into the Measurement of Short Fiber Content.

Four laboratories measured the short fiber content and other fiber properties of 45 commercial and experimental cotton fiber samples on high volume instrument (HVI), Suter-Webb Fiber Sorter, Advanced Fiber Information System (AFIS), and Peyer Almeter testing machines. The variation of short fiber content and average value differences amon..